Sunday

December 21, 2014

December 21, 2014

Total # Posts: 528

**math**

(7 x 4 - 4)/2 = 26 PEMDAS Do calculations in the parenthesis first: 24/2 = 26 Do you think that's true or false?
*October 13, 2014*

**Math**

C probably.
*October 13, 2014*

**Algebra 2**

should get a diagonal line
*October 13, 2014*

**Algebra 2**

Make a t chart and plug in an initial x to get your y to get your points then graph. for example: pick 1 for x as your starting y=|1|/2 - 3/4 y=-1/4 so first points are x=1 y=-1/4 x=2 y=??? x=3 y=??? so on..
*October 13, 2014*

**Math**

surface arena of a cone: A=pi*r(r+sqrt(h^2+r^2)) where r=radius Given: A= 258 cm^2 r=4 cm find h 258=(3.14*4)(4+sqrt(h^2+4^2)) 258=12.56(4+sqrt(h^2+16)) 258/12.56 = 4+sqrt(h^2+16) 16.54 = sqrt(h^2+16) square both sides 274.233 = h^2 + 16 258.233 = h^2 h=16.0696
*October 13, 2014*

**pre cal**

circumference of a circle: C=2*pi*r where r=radius=27/2=13.5ft pi=3.14 C=84.78 It's making 2 rotations every 2 seconds or in other words, 1 rotation every 1 second. note its asking for mph: 1hour=3600 12inch=1foot 1mile=5280 Formula to solve this: (n*C*3600)/(12*5280) ...
*October 13, 2014*

**math**

There are 75 employees, and they all get 2 weeks off per year, so total weeks off for everyone is: 75*2 = 150 weeks Now: 1 year = 52.18 weeks The total weeks that all 75 employees work without the 2 week vacation is: 75*52.18 = 3913.5 Total week - vacation week=net working ...
*October 13, 2014*

**MATH 101**

Can't really factor anything out of this. (7 a - 3 b) (8 a + 9 b) If you FOIL: you get 56a^2+39ab-7b^2 I just kind of did trial and error.
*October 13, 2014*

**Math**

If you tried 1 2 3 4 and took the product you would get 24 which doesn't equal one of the above numbers, so this combination wouldn't be correct.
*October 13, 2014*

**Math**

Take a look at 0,1,2,3 Those are 4 consecutive numbers. Now lets take the product of them: 0 * 1 * 2 * 3 = 0 As you can see, it's equal to one of the integers which is 0 So that meets the requirement. From those set of numbers, 3 is the largest.
*October 13, 2014*

**Algebra**

Hmm.. Let's break this down with what is given. There is a total of 1065.95 total. Mary has 122 in the cash register initially. So subtract 1065.95 - 122 = 943.95 943.95 is the total items she sold including tax Let's Figure out that amount excluding the tax, which is ...
*October 13, 2014*

**Math**

x<= 2100-300p 600 <= 2100 -300p p<= 5
*October 12, 2014*

**Algebra 2**

ah okay, well it's really basic algebra then. Just isolate the h h=(3v)/(pi*r^2)
*October 12, 2014*

**Algebra 2**

So…. what's given and what does it ask you to solve for?
*October 12, 2014*

**Math**

A = 1, otherwise the product would have 5 digits. D = 9 because A = 1. B = 0 or 1, otherwise the product would have 5 digits. If B = 1, then C = 0, otherwise the product would have 5 digits. But 1109 * 9 = 9981, which isn't right. So B = 0. Then 9*D = 9*9 = 81, so 8 + 9*C ...
*October 12, 2014*

**sci207**

LOL, this is a funny question.
*October 12, 2014*

**Algebra**

Yes. You are correct. y=3x plug 1000 into x 3 * 1000 = 3000
*October 12, 2014*

**engineering science N4**

I feel like the weight of the steel block has to be given in order to solve this problem…
*October 12, 2014*

**maths**

I set this up as a polynomial x^2-64x+960 factor this (x - 40)(x-24) where you it's roots to be 40 and 24 so 40 + 24 = 64 40 * 24 = 960
*October 12, 2014*

**CHEMISTRY**

First find molar mass of C6H12O6: I found it to be 180.1566 g/mol now find the ratio of moles 5.85/180.1566 = .0325mol Molality of C6H12O6: (.0325*1000)/255 = .127 note: the value 1000 is from the density of water which is 1.00g/mL So freezing point: delta_T = -k_f * m k_f = 1...
*October 12, 2014*

**physics**

yeah you are right, ignore my post.
*October 12, 2014*

**physics**

Final Velocity of 2.2kg ball: Vf = (V_i *(m1-m2) + (2m2*v_i2)/(m1+m2) v_i =1.27 m1=2.20 m2=7.2 v_i2 = 0 (because it was a rest initially) Vf=(1.27*(2.2-7.2)+(2*7.2*0)/(1.27+7.2)) =-6.35 For final Velocity of 2nd object: Vf = (V_i2 *(m2-m1) + (2m1*v_i/(m1+m2) Vf=(0*(7.2-2.2)+(2...
*October 12, 2014*

**Science quick question urgent check my answer**

Spores form part of the life cycles of many plants, algae, fungi and protozoa. In bacteria, spores are not part of a sexual cycle but are resistant structures used for survival under unfavourable conditions. --Wikipedia
*October 1, 2014*

**Math**

The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary? The statistics teacher decides the estimate should be accurate within half year and be 92% confident. From a previous study, the ...
*September 21, 2014*

**math **

you download 12 new songs to your mp3 player. then you delete 5 old songs.. write each amount as an integer?
*August 28, 2014*

**Math**

What do I do next after that?
*August 2, 2014*

**Math**

but i dont get the first one
*August 2, 2014*

**Math**

Simplify the following expressions by using trigonometric form and De Moivre's theorem a. (√3-i)^4 b. (-4+4i√3)^5 c.(2+3i)^4 d. (4-i)^6
*August 2, 2014*

**algebra**

A three quarter inch wire has 12 ohms resistance. How much resistance has the same length of half-inch wire, if resistance varies inversely as the square of the diameter?
*May 23, 2014*

**English**

What is a metaphor for a deep voice?
*May 22, 2014*

**Math homework help**

Check out the polar coordinate pairs that label the same point. Several pairs may be possible. A) (2, 2pi/3) B) (2, -pi/3) C) (-3, pi) D) (2, 7pi/3) E) (3,0) F) (-3,0) G) (-2, -pi/3) H) -3, 2pi)
*May 17, 2014*

**Algebra 1**

2+11b=8b+15
*November 4, 2013*

**DISCRETE MATHS**

Prove that if n is an odd positive integer, then 1 ≡ n2 (mod 4).
*October 25, 2013*

**DISCRETE MATHS**

Use the Euclidean Algorithm to find gcd(112,15)
*October 4, 2013*

**DISCRETE MATHS**

What is the cardinality of this set? {p, {p}, {p, {p}}} my answer is 1. is it right?
*September 2, 2013*

**finance**

12.6% is the wrong answer. Try 8.5%
*July 15, 2013*

**pre-calculus**

Move point (3,50 degrees) according to the following symmetries (keep positive) a. symmetrical to the origin b. symmetrical to theta=0 degrees c. symmetrical to theta= 90 degrees
*June 2, 2013*

**stats please help ASAP!!!**

A. The GPAs of all 5540 students enrolled at a University have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Let x be the mean GPA of a random sample of 48 students selected from this University. Find the mean and standard deviation...
*May 17, 2013*

**MATHS STATISTICS(PLEASE HELP ANYONE!!**

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by adjusting the ...
*May 13, 2013*

**MATHS STATISTICS**

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by adjusting the ...
*May 13, 2013*

**MATHS STATISTICS**

A. According to an estimate, 50% of the people in the United States have atleast one credit card. If a random sample of 30 persons is selected, what is the probability that 19 of them has atleast one credit card? PLIZ REALLY NEED HELP!! THANKS VERY MUCH..
*May 13, 2013*

**linear algebra**

solve using gauss jordan 10y − 4z + w = 1 x + 4y − z + w = 2 3x + 2y + z + 2w = 5 −2x − 8y + 2z − 2w = −4 x − 6y + 3z = 1
*May 13, 2013*

**Math**

The local dinner offers a meal combination consisting of an appetizer, two soups, four main courses, and five desserts. Your diet retricts you to choosing between a dessert and an appetizer. (You cannot have both). Given this restriction, how many three-course meals are possible?
*May 6, 2013*

**mathURGENT!!!!!!!!!!**

if 4^(x)-4^(x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????
*April 20, 2013*

**mathURGENT!!!!!!!**

if (4^x)-(4^x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????
*April 20, 2013*

**Physics**

A loop of wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.12 m. The normal to the plane of the loop is parallel to a constant magnetic field ( = 0°) of magnitude 0.85 T. What is the change ÄÖ in the ...
*April 8, 2013*

**Physics**

In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the magnitude of the earth...
*April 8, 2013*

**Physics**

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
*April 4, 2013*

**Physics**

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
*April 4, 2013*

**Physics**

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
*April 4, 2013*

**Physics**

An electron has a kinetic energy of 7.00 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 4.40 10-5 T. Determine the radius of the path?
*April 4, 2013*

**Physics**

A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
*March 25, 2013*

**Physics**

A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
*March 25, 2013*

**Physics**

An á-particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.16 106 V and then enters a uniform magnetic field whose magnitude is 3.00 T. The á-particle moves perpendicular to the ...
*March 25, 2013*

**mathURGENT!!!!!!**

how did you get that ms sue?
*March 20, 2013*

**mathURGENT!!!!!!**

for which integers will the square of the integer decreased by twice the integer produce a difference of less than 4? please answer and explain how you got the answer...please????!!
*March 20, 2013*

**Physics**

If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
*March 17, 2013*

**Quantum Physics**

If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
*March 11, 2013*

**Quantum Physics**

a) If |u>= |v> = |+ >, what is the probability that the measurement outcome is 0 ? b) If |u> = |+ > and |v> = |-> , what is the probability that the measurement outcome is 0 ?
*March 11, 2013*

**mathURGENT!!!!!!**

what is the greatest value of m such that 25!/5^m is an integer? hint: the exclamation point means "factorial". 3!=3*2*1=6 4!=4*3*2*1=24 etc. please answer and explain how you got it!!!!please???
*March 8, 2013*

**MA111**

lim x!0 k + cosmx x2 = −4 . FIND M AND X?
*March 7, 2013*

**math**

A telephone pole is 55 feet tall. Jeri stands in the shadow of the pole. She is 66 inches tall, gut her shadow is 12 feet long. How far away from the telephone pole is she standing.
*March 6, 2013*

**Maths**

How many ordered triples of positive integers (a,b,c) with 1<=a,b,c<=5 are there such that ax^2+bx+c has a rational solution?
*March 1, 2013*

**maths**

How many ordered triples of positive integers (a,b,c) with 1¡Üa,b,c¡Ü5 are there such that ax^2+bx+c has a rational solution?
*February 28, 2013*

**Probabilities**

A queen on an English chessboard is able to attack in the same row, column and diagonal. The probability that 2 randomly placed queens on an 8 by 8 chessboard will be able to attack each other can be expressed as a/b , where a and b are positive, coprime integers. What is the ...
*February 28, 2013*

**Physics**

The coil of wire in a galvanometer has a resistance of RC = 78.0 Ù. The galvanometer exhibits a full-scale deflection when the current through it is 0.440 mA. A resistor is connected in series with this combination so as to produce a voltmeter. The voltmeter is to have ...
*February 24, 2013*

**Physics**

In the drawing below, R1 has a resistance of 6.2 Ù and R2 has a resistance of 2.6-Ù. Determine the current (magnitude and direction) in the 6.2 and 2.6-Ù resistors in the drawing.
*February 24, 2013*

**Physics**

A battery has an internal resistance of 0.017 Ù and an emf of 9.00 V. What is the maximum current that can be drawn from the battery without the terminal voltage dropping below 8.75 V?
*February 23, 2013*

**math**

How much money would have to be deposited into a compound interest savings account earning 5% each year in order to accumulate $10,000 in 18 years?
*February 23, 2013*

**trig**

To determine the distance to an oil platform in the Pacific Ocean, from both ends of a beach, a surveyor measures the angle to the platform from each end of the beach. The angle made with the shoreline from one end of the beach is 83 degrees, from the other end 78.6 degrees. ...
*February 19, 2013*

**calculus**

I need help with this problem: The path traveled by a golf ball with a 9-iron can be modeled with the quadratic equation, y= -0.042xsquared + 5x, where x is the distance in yards from the point it was hit and y is the height of the golf ball in feet. Assume that the ground is ...
*February 19, 2013*

**Physics**

The electric potential energy stored in the capacitor of a defibrillator is 77 J, and the capacitance is 123 µF. What is the potential difference that exists across the capacitor plates?
*February 18, 2013*

**Spanish Please help**

14)c 15)b 16)d 17)c 18)b
*February 14, 2013*

**Spanish please help**

yes sir!
*February 14, 2013*

**Spanish please help**

3) pienso 4)entiende 5)prefieren 6)quieres 7)pensamos 8)cierre 9)cerramos 10)digo 11)dice 12)decimos 13)dicen
*February 14, 2013*

**Spanish**

1) a 2)c
*February 14, 2013*

**mathURGENT!!!!!!!!!!**

find all ordered pairs of positive integers (x,y) that satisfy the following equation: x^y=2^64. please answer and explain how you got it!!!!
*February 14, 2013*

**mathURGENT!!!!!!**

the lines satisfying the equations x+2y=3 and 3y+ax=2 are perpendicular to each other. find the value of 'a'. please answer and explain how you got, please!!
*February 5, 2013*

**mathURGENT!!!!!!**

determine the smallest prime number that divides the following sum: 3^12+5^13+7^14+11^15? please answer and explain step by step how u got it!!!!
*February 4, 2013*

**Physics**

The drawings show three charges that have the same magnitude but different signs. In all cases the distance d between the charges is the same. The magnitude of the charges is |q|= 5.5 µC, and the distance between them is d = 4.3 mm. Determine the magnitude of the net ...
*February 3, 2013*

**Physics**

Two tiny conducting spheres are identical and carry charges of -19.8 µC and +54.5 µC. They are separated by a distance of 2.45 cm. (a) What is the magnitude of the force that each sphere experiences, and is the force attractive or repulsive? 1 N 2 ---Select--- ...
*January 29, 2013*

** mathURGENT!!!!!!!**

a certain type of candy is sold in small boxes of 8 and large boxes of 15. notice it would be impossible to buy exactly 12 candies without breaking up a box. it would also be impossible to buy 17 candies without breaking up a box. what is the greatest number of candies that it...
*January 26, 2013*

**math URGENT!!!!!!!**

a certain type of candy is sold in small boxes of 8 and large boxes of 15. notice it would be impossible to buy exactly 12 candies without breaking up a box. it would also be impossible to buy 17 candies without breaking up a box. what is the greatest number of candies that it...
*January 22, 2013*

**MATH URGENT!!!!!!!**

the will of an eccentric millionaire reads as follows: "i leave 4/17 of my estate to my son, 7/13 of the remainder to my wife, 2/3 of this remainder to my daughter, and the remaining $2million to my dog." what was the total amount of the estate? please answer and ...
*January 19, 2013*

**CHEMISTRY**

An equilibrium mixture of the following reaction was found to have = 0.0325 at 1200 degrees C. What is the concentration of I? I2(g)<->2I (g) Keq=1.3×10−2 at 1200
*November 28, 2012*

**chem 4 **

How many grams of sodium chloride are needed to make 1 L of 0.9% (m/v) sodium chloride solution (“isotonic saline”).
*November 22, 2012*

**chem 3 **

(a) If H is positive and S is negative, would G to be positive or negative or is it dependent on T? (b) For the sign of G that you have in part (a) would the reaction be spontaneous, nonspontaneous, or dependent on the value of T?
*November 22, 2012*

**chem 2**

What is the concentration of the final solution if 1 liter of 6 M HCl is diluted to a final volume of 2 L?
*November 22, 2012*

**chem 1**

if 58.44 g of sodium chloride is dissolved in 0.5 liter of water what is the molarity of the sodium chloride solution? The molar mass of sodium chloride is 58.44 grams per mole.
*November 22, 2012*

**chem **

2 NO(g) + O2(g) 2 NO2(g) For the reaction above tell whether the reaction would shift to the left (L) or right ® if I a. Increased the total pressure of the system b. Removed O2 from the system c. Increased the amount of NO in the system
*November 22, 2012*

**Physics**

A 0.069-kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.95 m. With what speed does the arrow leave the bow?
*November 12, 2012*

**Physics**

A cable lifts a 1060-kg elevator at a constant velocity for a distance of 39 m. What is the work done by each of the following?
*November 12, 2012*

**Physics**

A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.0120 s. The average force exerted on him by the ground is +17000. N, where the upward direction is taken to be the positive direction. ...
*November 12, 2012*

**Physics**

Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
*November 7, 2012*

**Physics**

Two banked curves have the same radius. Curve A is banked at an angle of 11°, and curve B is banked at an angle of 16°. A car can travel around curve A without relying on friction at a speed of 18.5 m/s. At what speed can this car travel around curve B without relying ...
*November 7, 2012*

**Physics**

A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (è = 60.0°) Suppose the total mass of a chair and its occupant is 222 kg
*November 7, 2012*

**physics**

Each of the space shuttle's main engines is fed liquid hydrogen by a high-pressure pump. Turbine blades inside the pump rotate at 595 rev/s. A point on one of the blades traces out a circle with a radius of 0.02 m as the blade rotates. (a) What is the magnitude of the ...
*November 7, 2012*

**physics**

A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 4.20 104 s. What is the speed at which the satellite travels?
*November 7, 2012*

**Physics**

A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle è = 20°. For a speed of 40 m/s, at what value of the distance d should a driver locate his ...
*November 7, 2012*

**Physics**

Two banked curves have the same radius. Curve A is banked at an angle of 11°, and curve B is banked at an angle of 16°. A car can travel around curve A without relying on friction at a speed of 18.5 m/s. At what speed can this car travel around curve B without relying ...
*November 7, 2012*

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